Balluff MATRIX VISION mvBlueGEMINI - Page 42

mvBlueGEMINI Technical Manual (EN) v2.6
APPENDIX 41
Direction
Angle
Applications
Specialty
• also suitable for rough, poorly
reflecting surfaces
• possible with coaxial mirror
lighting
Dark
field
• emphasizing shapes, scratches,
cracks, etc.
• determines both, engraved and
raised structures
• suitable for transparent and
opaque parts
• particularly suitable for surface
inspections, also highly reflective
parts
• difficult with dirt
11.3.2.2 Lighting structure
Besides homogenous light there are following lighting structures:
Dimensions
Illuminant
Procedure
Specialty
0
Light point
Triangulation
• light beam is sent to the surface obliquely
• if the object's distance changes in front of the
lens, the point where the light passes the lens will
move laterally
• the lateral movement will be displayed and
measured
• the lateral offset of the image is a measure for
the change in distance
1
Light line
Light section
method
• oblique projection
• translate depth information in image coordinates
(e.g. z in x)
• expand the triangulation principle to many
parallel measurements (here the Y coordinate)
2
Light grid
Grid projection
method
• phase shift process returns dense spatial
information